Triethylamine → Cyclopropyl-(1-{3-[2-methyl-4-(3-methyl-4,10-dihydro-3H-2,3,4,9-tetraaza-benzo[f]azulene-9-carbonyl)-phenyl]-propionyl}-piperidin-4-ylmethyl)-carbamic Acid Tert-butyl Ester

Participants

Reaction Steps

WSCD (1.08 g, 5.6 mmol) and DMAP (343 mg, 2.8 mmol) were added to a solution of 4-(3-{4-[(tert-butoxycarbonyl-cyclopropyl-amino)-methyl]-piperidin-1-yl}-3-oxo-propyl)-3-methyl-benzoic acid from Example E86.2 (1.25 g, 2.8 mmol) in dichloromethane (100 ml) and triethylamine (0.783 ml, 5.6 mmol). The mixture was stirred for 1 h at room temperature then 3-methyl-3,4,9,10-tetrahydro-2,3,4,9-tetraaza-benzo[f]azulene from Example E11 (676 mg, 3.4 mmol) was added. The mixture was heated at reflux for 2 days, washed with saturated NaHCO3 then brine, dried and concentrated in vacuo. The residue was purified by flash chromatography on silica gel (eluant; 2% methanol:98% EtOAc to 5% methanol:95% EtOAc) to yield the title compound (1.1 g, 62%).

Provenance & Evidence